Flow resistance in alluvial channels

Auteur(s) et Affiliation(s)



Description :
Significant progress has been made towards predicting flow resistance (and therefore velocity) for a given discharge. Different types of equations have been shown to provide reasonably good estimates in specific environments. Major difficulties arise from characterizing mobile beds, bed topography and its evolution and how these factors control rates of change of average velocity as discharge rises along a given river reach. Different issues can be recognized as a function of the spatial and temporal scales of investigation. More emphasis should be placed upon reach-scale investigations. Detailed studies of bed topography, its maintenance, its evolution (at the reach scale) and its interactions with macroturbulence structure and sediment transport would ultimately provide valuable information and improved knowledge on both flow resistance processes and applications (predictions).


Type de document :
Article de périodique

Source :
Progress in physical geography, issn : 0309-1333, 2011, vol. 35, n°. 6, p. 765-781, nombre de pages : 17, Références bibliographiques : 4 p.

Date :
2011

Editeur :
Pays édition : Royaume-Uni, London, Sage Publications